推荐回答（5个）
?老年人味蕾功能本身已开始衰退，所以受疾病影响更为明显；一旦发生味觉障碍，应该从全身口腔疾病两方面去找原因。
从味觉看健康
进食后，为何会有甜、酸、苦、咸的感觉?这全靠味觉器官舌的功效。舌面上的味蕾，能感受到口腔内各种化学刺激，当食物的可溶性有味物质与味蕾接触，味蕾里的细胞纤毛就把感觉讯息传送至大脑皮质中枢，於是产生味觉。若味觉异常，可能是体内潜藏疾病的信号。 口淡
面对佳肴美食，也觉淡然无味，食欲欠佳。原因可能是外感不适，或是脾胃虚弱，运化不畅，以致不思饮食。此时宜健脾益气。
口酸
即使没有进食酸性食物亦自觉口中有酸味。这情况是因肝胃不和，或肝有郁火所致。患者可能有胃炎或消化性溃疡，以致胃酸较正常为多。
口苦
人体惟一能产生苦味的器官是胆，若感到口苦，即肝胆出问题，通常是因肝胆有热引致。《灵枢 四时气》：「胆液泄则口苦」。若经常进食燥热的食物，会引致肝火上升，亦会燃烧体内津液，因而感到口苦。
经常熬夜或抽烟的人，早上醒来亦会感到口苦。
口甜
口中经常有甜味，多因湿热积於脾所致。另外，消化系统功能紊乱，挠乱各种的分泌，唾液中淀粉含量增加，刺激舌致上味蕾，因而感到甜味。糖尿病者也有口甜的感觉，因为体内血糖增高，唾液中的糖份也增多，因而有甜味。
口咸
多属肾虚，是肾液上泛引致。
年纪大了,经常会出现味觉退化的症状.
味觉退化可分为生理性和病理性.一般来说,年纪大了,舌乳头和味蕾的味觉神经末梢就会萎缩,衰退,味觉自然会逐渐减退. 很多老年人认为东西不如以前好吃了,这也主要跟老年人的味觉退化有关.很多年轻人也抱怨,他们年迈的父母做的饭菜味道远不如以前了,原因就是味觉退化了. 味觉突然丧失是病.而病理性的味觉退化或丧失大多是突发性的,此时人们应及时到医院检查,明确原因.老年人突发味觉减退,大多数与长期服用药物有关.不少药物,如抗高血压药,糖尿病药,抗抑郁药,抗生素等,若长期服用,有可能引起味觉改变.因此,服药者应注意味觉是否出现异样.一旦发现味觉不如从前了,应该和医生商量换药. 此外,漱口水使用不当,也可能加快味觉退化.正确的做法是在医生指导下使用,若自行使用,建议用生理盐水代替.中青年人若突然失去味觉,应警惕颅脑神经问题,需要及时去医院诊断和治疗.
淡食物保护味觉
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